[RodMcM]

Hi I have a 6040 and mainly use it 3-6 mm acrylic, have had it for about 9 months and generally impressed for the level of work I need. I have recently, for fun, put on a standalone 3D printer head and connected to A drive in Mach 3. All goes well, except for a totally repeatable lean on the Y axis, towards the Y zero ( print center is 100,100). Have read all the references I can on lost steps, but this is strange as it is going on one directlion only.
So after all sorts of experiments with rates, acc, puls times etc I get no change to the slope. The most telling is that by changing the Port settings for the X and Y on Mach 3 I get no change ion the slope ( accept that it goes a different way), so that tells me that there is nothing wrong in the parallel break out board, nor the CNC dfrives.
The attached photos show the front view (X axis) is almost square sides, the Y axis slope and the shot with three together shows the repeatability.

For interest I have included a shot of the 3D printer attachement as well